Process of preparing cloth for testing its resistance to wearing.



I p U NITED STATES PAT NT oFrIcE.

ADOLF nnnrnsz. 'OFIvIAiNKUR, GER-MANY.

rnocnss or PREPARING CLOTH .ron Ta as. rr's nnsrsrnnon 'ro wnenine.

No Drawing.

To all whom it may concern Be it knownthat I, Anon-r Knirrnsz, a subject of the Kingdom of Hungary, and a; resident of Bismarckstrasse" 5, Mainkrini Germany, have invented certain new and.

useful Improvementsin"Processes of l reparing Cloth for Testing its Resistance to Wearing.

Heretofore it has been the general practice to test the quality and strength of cloth; on the dynamometer by determining the elasticity and the resistance to tearing. It has however beenobserved that in the great majority of cases the values thus obtained" terials at Lichterfelde (see Lehnes F621"- berzcitzmg 1911 page 118) remarked very adequately that it is not possible to test in this Way. i

It has now been discovered that an excellent measure of the resistance of cloth to wear and tear is obtained by treating it previous to testing-in such a way that the interior parts and the surface become perfectly uniform and only subsequently testing the cloth on a scraping, rubbing, or other kind of grinding or, beating machine.

The production of perfect evenness of the interior and the surface of the cloth is the significant point of the invention and may be attained by the following means: (a) the samples are first thoroughly wetted and then dried and evenly pressed; (6) the samples are boiled in water alone or in water containing slight quantities of alkalis, acids, glycerin, sulfoleates or similar very gently acting substances, and subsequently dried and possibly pressed; (0) the samples are treated with alcoholic or ethereal. liquids or hydrocarbons and dried; (of) the samples are evenly raised by mechanical meansand then pressed. I

The treatments may be modified according torequirements or one may be combined with another. Very good results are obtained e. g. by treatinglone hourwith alcofipecificatimi Letters Patent.

Patented Nov. 3, 1914.

Application filedllfiarch 14, 1814. Serial No. 824,696.

Jhol, then hour at 8090 C. in Water and afte rdrying and uniform pressing finally testingon a scrapin machine; Thus the various kinds of mi itary cloth in use in Germany have given the following coinparative values on an average on being subjected twice to comparative tests.

The experiences gathered allow of the conclusion that the values obtained by'the new method are more reliable thanv the former, anda further proof is adduced by treating the cloth with substances which undoubtedly deteriorate the wool, e. g. soda or chlorid of lime and subsequently testing it comparatively on a dynamometer and on a scraping machine after the indicated prei paratory treatment.

Fieldgray 1111 described below and then tested.

Testing on the dyna- Testing mometer. on the scraping machine after the Breakir u fire??- *s 'i l'!'1U 1n- SmmL Elastic ty (Heated above.

Kilogmms. Omti'mcters. (a) Fieldgray cloth 66.8 11.9 100 (b) Cloth (a boiled one hour with 40 times its weight of water to which 1/2 gram soda ash per liter had f been added... 67.9 10.2 94 (0) Like lb) with ash per liter 61.8 9.2 67 (d) Cloth (a) treated with chlorid of lime 1/5 Baum by first'acidulating the cloth, then chlorinating. acidulating and finally rinsing until neutral 50.1 10. 6 76 (0) Like (d) with chlorid of lime 2/5 Baum. '77. 6 10.3 64

testing shows agradual decrease up to 33 litary cloth was treated as per cent. It is further demonstrated that the Values of breaking strength are considerably increased by the treatment with chlorid of lime and the elasticity is but slightly diminished whereas the new method of testing indicates deteriorations of 34'36 per cent.

That the Values obtained by the new method are more correct may be directly deduced from the fact that the treatment with soda is detrimental to the wool and that chlorinated wool, so-called silk-wool has-been found to be much less durable to wearing than non-chlorinated wool.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed, I declare that what I claim is:

1. The process of preparing cloth for testing its resistance to wearing, consisting in Copies of this patent maybe obtained for five cents each, by addressing Washington, I). C.

subjecting the cloth to wetting and pressing boiling, treating with alcoholic liquids, an raising and pressing.

2. The process of preparing cloth for testing its resistance to wearing, consisting in Witnesses JEAN GRUND, CARL 'GRUnD.

the Commissioner of Patents, 

